AS 60068.2.65-2003

1 - AS 60068.2.65-2003 ENVIRONMENTAL TESTING - TESTS-TEST Fg: VIBRATION, ACOUSTICALLY INDUCED
4 - PREFACE
5 - CONTENTS
6 - INTRODUCTION
7 - 1 Object
7 - 2 Normative references
8 - 3 Definitions, symbols and abbreviations
8 - 3.1 Definitions
8 - 3.1.1 acoustic horn
8 - 3.1.2 analysis integration time:
8 - 3.1.3 bandwidth
8 - 3.1.4 overall sound pressure level (OASPL):
8 - 3.1.5 centre frequency
8 - 3.1.6 constant-bandwidth filter
8 - 3.1.7 cut-off frequency
9 - 3.1.8 diffuse sound field:
9 - 3.1.9 electro or hydraulic-pneumatic transducer:
9 - 3.1.10 frequency interval
9 - 3.1.11 measuring points:
9 - 3.1.12 multipoint control:
9 - 3.1.13 narrowband frequency filter:
9 - 3.1.14 broadband frequency or wide band filter:
10 - 3.1.15 progressive wave tube:
10 - 3.1.16 proportional-bandwidth filter
10 - 3.1.17 reverberation room
10 - 3.1.18 sound absorption coefficient
10 - 3.1.19 sound pressure p
10 - 3.1.20 standing wave tube:
10 - 3.2 Symbols and abbreviations
11 - 4 Acoustic environments and requirements for testing
11 - 4.1 Acoustic environment for testing
11 - 4.1.1 Reverberant field testing
11 - 4.1.2 Progressive wave testing
11 - 4.1.3 Cavity resonance testing
11 - 4.1.4 Standing wave testing
11 - 4.2 Sound sources
11 - 4.3 Measuring apparatus
11 - 4.3.1 Acoustic measurements
12 - 4.3.2 Vibration response measurements
12 - 4.3.3 Analysis of results
12 - 4.4 Requirements for testing
12 - 4.4.1 Type of facility
13 - 4.4.2 Mounting
13 - 4.4.3 Specimen instrumentation
13 - 4.4.4 Preparation of reverberation room
14 - 5 Severities
14 - 6 Preconditioning
14 - 7 Initial measurements
14 - 8 Testing
14 - 8.1 Normal testing
15 - 8.2 Accelerated testing
15 - 9 Intermediate measurements
15 - 10 Recovery
15 - 11 Final measurements
15 - 12 Information to be given in the relevant specification
21 - Annex A - Guidance for the test requirements
21 - A.1 Reverberation room testing
23 - A.2 Progressive wave tube testing
23 - A.3 Cavity resonance testing
23 - A.4 Standing wave tube testing
24 - A.5 The selection of sound sources
25 - A.6 Severities
25 - A.7 Accelerated testing
26 - A.8 Analysis integration time
27 - Annex B - Bibliography

Provides standard procedures and guidance for conducting acoustic tests in order to determine the ability of a specimen to withstand vibration caused by a specified sound-pressure level environment to which it is, or is liable to be, subjected.

To provide standard procedures and guidance for conducting acoustic tests in order to determine the ability of a specimen to withstand vibration caused by a specified sound-pressure level environment to which it is, or is liable to be, subjected. For sound pressure level environments of less than 120 dB acoustic tests are not normally required.To determine mechanical weakness and/or degradation in the performance of specimens and to use this information, in conjunction with the relevant specification, to decide their acceptability. In some cases, the methods of test may also be used as a means of establishing the mechanical robustness or fatigue resistance of specimens.This part of IEC 60068 describes the procedures for conducting tests and for measurement of the sound pressure levels within the acoustic noise field and considers the need for measurement of the vibration responses at specified points on the specimen. It also gives guidance for the selection of the acoustic noise environment, spectrum, sound pressure level and duration of exposure.

First published as AS 60068.2.65-2003.